Restless is the River / August Derleth — New York : Scribner’s, 1939.
— Dedicated to Lewis.

Plays of Gods and Men / Lord Dunsany — Boston : Luce, 1917.
— Formerly owned by Lewis; signed.

Pep: J.L. Wetcheeks Amerikanisches Liederbuch / Lion Feuchtwanger ; [illustrationen von Frans Haacken] — Berlin : Aufbau-Verlag, 1957.
— Dedicated to Sinclair Lewis.
— Inscribed by Feuchtwanger to Viktoria Wolff.

Walden / Henry David Thoreau — New York : Crowell, 1899.
— Formerly owned by Lewis; signed by him on front free endpaper. His markings and annotations appear throughout. Inside the front cover he has written: “NY Aug. ’07 / Read in noon-hours of freedom from the semi-bondage of ‘Tales’; on benches in Bryant Park; my Walden 2 feet of bench, my pond a drinking fountain, my forest a few elms and maples, where sparrows twittered / SL.” Lewis was then working for Transatlantic Tales in New York.

The Crystal Box / Hugh Walpole — limited ed. — Glasgow : printed for the author by Robert Maclehose & Co., 1924.
— Dedicated to Lewis and others.

The Science of Life / H.G. Wells — Garden City, N.Y. : Doubleday, Doran, 1931.
— 2 volumes.
— Formerly owned by Lewis; signed.

The Apple of the Eye / Glenway Westcott — 1st ed. — New York : Dial Press, 1924.
— Inscribed by Lewis to journalist Frazier Hunt.

The Birthday of the Infanta / Oscar Wilde — New York : Macmillan, 1929.
— Formerly owned by Grace Lewis; signed and annotated. Two photographs of Wells Lewis in costume pasted to front free endpaper, beneath which Grace has written: “Wells Lewis (son of Sinclair and Grace Lewis) as the Infanta … June, 1929”